Greyed out emails in inbox

Sometimes I get emails where I can see a representation of the form of an email but the words themselves are greyed out. I I open my inbox in Outlook I can see them fine. There is no pattern to this but it seems to happen for about one out of ten emails. It is a recent problem (observed over the last fortnight). I am using Nextcloud Hub 3 (25.0.2) and Mail 2.2.2
I can download the source OK and locate the text.

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